Fog clings to the wetlands as the sun rises above Horicon National Wildlife Refuge in Wisconsin. The refuge includes more than 15,000 acres of marsh habitat including dense stands of cattail, bulrushes, burreed, sedges and smartweeds – all great food for ducks and other migrating birds. It’s an amazing place for bird-watching as well as photography, fishing, hunting and exploring the effigy mounds left behind by Native Americans over 1,000 years ago. Photo by Rachel Samerdyke, U.S. Fish and Wildlife Service.